The details of buttons are to be configured on the Inspector window, which opens using -I or from the Tools menu.
In the middle of the inspector window shown here you can edit the details of the button selected on the opened VRC.
Besides giving a title to a button you may also enter a comment which will become visible as a tooltip hovering over the button of the VRC in use.
If you check "Button sends repeatedly" the button can send codes up to 5 times, when you hold the mouse button down on the VRC. The limit of 5 is built-in to prevent from unintentional sending codes too often which could lead to a damage of AV components, e.g. with a destructive sound volume.
Listed in the table "Action(s)" you find all actions which are assigned to the selected VRC button. The actions will be performed one by one beginning from the top, if the VRC button is clicked or the remote trigger IR code is received.
Please use the buttons on top of the inspector window to add or delete actions to this list. Until now rearranging the actions isn't possible.
To trigger a VRC button with a remote control (e.g. sitting on the sofa, using your conventional RC), you may assign an IR code using the popup button. Select an IR code action in the archive on the right, then choose "Use IR-code from archive" on the popup:
If you later send the respective IR code and the VRC is on-screen, the VRC button reacts, as if it had been clicked. For details please look at the chapter "Remote Control the Mac".